Add libpalmrejection_test to inputflinger presubmit

The libpalmrejection library is going to be used in the input code, so
let's run the libpalmrejection_test unit test whenever we change input
code to prevent regressions.

Bug: 198472780
Test: cd services/inputflinger && atest
Change-Id: I4fabb51395b758c578bdef967899c76d17959c18